[AWS] check mode for ec2_elb and elb_instance (#42694)

what ELBs an instance will be deregistered from prior to actually
executing

lib/ansible/modules/cloud/amazon/ec2_elb.py

@@ -332,6 +332,7 @@ def main():
 
     module = AnsibleModule(
         argument_spec=argument_spec,
+        supports_check_mode=True
     )
 
     if not HAS_BOTO:
@@ -359,10 +360,11 @@ def main():
                 msg = "ELB %s does not exist" % elb
                 module.fail_json(msg=msg)
 
-    if module.params['state'] == 'present':
-        elb_man.register(wait, enable_availability_zone, timeout)
-    elif module.params['state'] == 'absent':
-        elb_man.deregister(wait, timeout)
+    if not module.check_mode:
+        if module.params['state'] == 'present':
+            elb_man.register(wait, enable_availability_zone, timeout)
+        elif module.params['state'] == 'absent':
+            elb_man.deregister(wait, timeout)
 
     ansible_facts = {'ec2_elbs': [lb.name for lb in elb_man.lbs]}
     ec2_facts_result = dict(changed=elb_man.changed, ansible_facts=ansible_facts)

lib/ansible/modules/cloud/amazon/elb_instance.py

@@ -328,6 +328,7 @@ def main():
 
     module = AnsibleModule(
         argument_spec=argument_spec,
+        supports_check_mode=True
     )
 
     if not HAS_BOTO:
@@ -355,10 +356,11 @@ def main():
                 msg = "ELB %s does not exist" % elb
                 module.fail_json(msg=msg)
 
-    if module.params['state'] == 'present':
-        elb_man.register(wait, enable_availability_zone, timeout)
-    elif module.params['state'] == 'absent':
-        elb_man.deregister(wait, timeout)
+    if not module.check_mode:
+        if module.params['state'] == 'present':
+            elb_man.register(wait, enable_availability_zone, timeout)
+        elif module.params['state'] == 'absent':
+            elb_man.deregister(wait, timeout)
 
     ansible_facts = {'ec2_elbs': [lb.name for lb in elb_man.lbs]}
     ec2_facts_result = dict(changed=elb_man.changed, ansible_facts=ansible_facts)